Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16d694fb2622e66…

MALICIOUS

PDF

72.9 KB Created: 2021-02-27 00:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c97fb51939583b73881f9e8debfc7c1f SHA-1: 864130bfe254e0c04d4879720e24525d4faedf68 SHA-256: c16d694fb2622e662fc6dca511d4bdea7e95076919c52902cac89311d74d8aae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/strik?utm_term=how+to+get+certified+as+a+psychiatric+nurse PDF link annotation
    • http://lordtrans.ru/8965147749683bfk.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/vamuluf.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/what_are_the_five_basic_steps_of_psychological_first_aid.pdfIn PDF document text
    • http://yellownatural.space/380112025551l59j.pdfIn PDF document text
    • https://siduwibe.weebly.com/uploads/1/3/4/7/134775996/e6787a1d2d90b.pdfIn PDF document text
    • https://letavozogat.weebly.com/uploads/1/3/5/9/135978758/65b96ca7a339.pdfIn PDF document text
    • https://pavofadibap.weebly.com/uploads/1/3/4/3/134370944/9567773.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/8675964168.pdfIn PDF document text
    • http://getcreditreport.info/sociopatia_psicopatiam6gbj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sepawi/92227765392.pdfIn PDF document text
    • http://jiwerefupuz.epizy.com/30571396498.pdfIn PDF document text
    • http://zaninenuj.rf.gd/dimulogifegodaridivameke.pdfIn PDF document text
    • http://pexevogawi.epizy.com/asepsia_y_antisepsia_enfermeria.pdfIn PDF document text
    • http://dopovis.myartsonline.com/current_issues_in_environmental_ethics.pdfIn PDF document text
    • http://nenutufap.epizy.com/66654514971.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/bunny_movie_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/16257126436.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/23005104584.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DA 5540 bytes
SHA-256: 1885a2a9d0a30bbfb1a3208b392d6d26b2985c91cedc8860cdfbe7cd1edcbbf1
font_01_sfnt_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 10136 bytes
SHA-256: 2d725d3ad2c0c48ee22ffc5649b3303267011c8ade9dea93d7414b3283898f1d

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